Outllok Classic data file compatibility after encryption.

pgre123 40 Reputation points
2026-09-28T15:32:40.8066667+00:00

In Windows 11 Outlook Classic if I change from non-encrypted to SSL/TSL encryption and a different port will my existing data in the @btinternet.com.pst file still be readable after the change?

Outlook | Windows | Classic Outlook for Windows | For home
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Answer accepted by question author
SD - IA 180.4K Reputation points Independent Advisor
2026-09-28T16:24:19.4733333+00:00

Hi,

Yes. Changing the encryption type (SSL/TLS) and port number in Classic Outlook will not affect the existing data stored in your btinternet.com.pst file.

The new SSL/TLS and port settings only affect how Outlook connects to the BT Internet mail server for sending and receiving new messages.

I hope this information helps. If you have any more questions, don't hesitate to reach out. Wishing you good luck!

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